A polyethylene pipe

ABSTRACT

A polyethylene pipe comprising components A) and B), wherein component A) is a hindered amine light stabilizer containing a triazine residue, component B) is a natural or synthetic hydrotalcite and the weight ratio of component A) to component B) is 1:10 to 10:1.

The present invention relates to a polyethylene pipe comprisingcomponents A) and B), wherein component A) is a hindered amine lightstabilizer containing a triazine residue, component B) is a natural orsynthetic hydrotalcite and the weight ratio of component A) to componentB) is 1:10 to 10:1, preferably 1:5 to 5:1.

In more detail, the pipe according to the present invention preferablyconsists of a polyethylene composition comprising the components A) andB) in a weight ratio of 1:10 to 10:1.

Component A) is in particular at least one compound of the formula(A-I), (A-II) or (A-III)

wherein A₁₁ is C₂-C₁₈alkylene, C₅-C₇cycloalkylene orC₁-C₄alkylenedi(C₅-C₇cycloalkylene),

the radicals A₁₂ independently of one another are hydrogen, C₁-C₁₂alkylor C₅-C₁₂cycloalkyl,

A₁₃ and A₁₄ independently of one another are hydrogen, C₁-C₁₂alkyl,C₅-C₁₂cycloalkyl or a group of the formula (a-1),

or the radicals A₁₃ and A₁₄, together with the nitrogen atom to whichthey are bonded, form a 5- to 10-membered heterocyclic ring and

a₁ is a number from 1 to 20, preferably 2 to 20, and the repeating unitsare identical or different;

wherein A₂₁ and A₂₅ independently of one another are hydrogen,C₁-C₁₂alkyl, C₅-C₁₂cycloalkyl or a group of the formula (a-1),

A₂₂, A₂₃ and A₂₄ independently of one another are C₂-C₁₀alkylene, and

X₁, X₂, X₃, X₄, X₅, X₆, X₇ and X8 independently of one another are agroup of the formula (a-2),

in which A₂₆ is hydrogen, C₁-C₁₂alkyl, C₅-C₁₂cycloalkyl or a group ofthe formula (a-1) as defined above, and A₂₇ has one of the meanings ofA₁₂;

wherein

R₁ and R₂ independently of one another are hydrogen, C₁-C₂₂alkyl, —O.,—OH, —CH₂CN, C₁-C₁₈alkoxy, C₂-C₁₈alkoxy substituted by —OH;C₅-C₁₂cycloalkoxy, C₃-C₆alkenyl, C₃-C₆alkenyloxy, C₇-C₉phenylalkylunsubstituted or substituted on the phenyl by 1, 2 or 3 C₁-C₄alkyl; orC₁-C₈acyl; and

R₃ and R₄ independently of one another are C₁-C₂₂alkyl or a group of theformula (a-3)

wherein R₀ has one of the meanings of R₁ and R₂.

Component B) is preferably a mixed hydroxide of the formula (B-I) or(B-II).

M²⁺ _(1-a)M³⁺ _(a)(OH)₂(A^(b−))_(a/b)×c H₂O   (B-I)

M²⁺ _(d)Al³⁺ ₂(OH)_(2d+6−eb)(A^(b−))_(e)×f H₂0   (B-II)

M²⁺ is for example Ca²⁺, Mg²⁺, Sr²⁺, Ba²⁺, Zn²⁺, Pb²⁺, Sn²⁺ or Ni²⁺.

M³⁺ is for example Al³⁺, B³⁺ or Bi³⁺.

a is for example a number up to 0.5.

A^(b−) is an anion of valency b, for example Cl⁻, Br⁻, NO³⁻, CO₃ ²⁻, SO₄²⁻ or SeO₄ ³⁻.

b is for example an integer from 1 to 4.

c is for example zero or a number up to 2.

d is for example a number up to 6.

e is for example a number up to 2.

f is for example zero or a number up to 15.

Hydrotalcites which are of interest are layered double hydroxides thatcontain positively charged hydroxide layers and charge balancing anionslocated in the interlayer region.

Component B) is in particular at least one magnesium aluminum hydroxidecarbonate hydrate which is for example commercially available asHycite®713, ®DHT-4A, ®DHT-4V, ®DHT-4A-2, ®DHT-4C or Sorbacid®911, orzinc aluminum hydroxide carbonate hydrate which is for examplecommercially available as ®ZHT-4V or Sorbacid®944, or mixtures thereof.

Of particular interest is a magnesium aluminum hydroxide carbonatehydrate which is for example commercially available as Hycite®713 orDHT-4A.

Examples of alkyl having up to 22 carbon atoms are methyl, ethyl,propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl,2-ethylbutyl, n-pentyl, isopentyl, 1-methylpentyl, 1,3-dimethylbutyl,n-hexyl, 1-methylhexyl, n-heptyl, isoheptyl, 1,1,3,3-tetramethylbutyl,1-methylheptyl, 3-methylheptyl, n-octyl, 2-ethylhexyl,1,1,3-trimethylhexyl, 1,1,3,3-tetra-methylpentyl, nonyl, decyl, undecyl,1-methylundecyl, dodecyl, 1,1,3,3,5,5-hexamethyl-hexyl, tridecyl,tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl and eicosyl.C₁-C₁₈alkoxy is for example methoxy, ethoxy, propoxy, isopropoxy,butoxy, isobutoxy, pentoxy, isopentoxy, hexoxy, heptoxy, octoxy,decyloxy, dodecyloxy, tetradecyloxy, hexadecyloxy or octadecyloxy.

C₂-C₁₈alkoxy substituted by —OH is for example 2-hydroxyethoxy.

C₅-C₁₂cycloalkyl is for example cyclopentyl, cyclohexyl, cycloheptyl,cyclooctyl, cyclodecyl or cyclododecyl. C₅-C₈Cycloalkyl, in particularcyclohexyl, is preferred. C₅-C₁₂cycloalkoxy is for example cyclopentoxy,cyclohexoxy, cycloheptoxy, cyclooctoxy, cyclodecyloxy orcyclododecyloxy. C₅-C₈Cycloalkoxy, in particular cyclopentoxy andcyclohexoxy, is preferred.

C₃-C₆alkenyl is for example allyl, 2-methallyl, butenyl, pentenyl orhexenyl. Allyl is preferred. The carbon atom in position 1 is preferablysaturated.

C₃-C₆alkenyloxy is for example propenyloxy.

C₇-C₉phenylalkyl unsubstituted or substituted on the phenyl by 1, 2 or 3C₁-C₄alkyl is for example benzyl, 2-phenylethyl, methylbenzyl,dimethylbenzyl, trimethylbenzyl or tert-butylbenzyl.

Examples of C₁-C₈acyl are formyl, acetyl, propionyl, butyryl, pentanoyl,hexanoyl, heptanoyl, octanoyl, acryloyl, methacryloyl and benzoyl.C₁-C₈Alkanoyl, C₃-C₈alkenoyl and benzoyl are preferred. Acetyl andacryloyl are especially preferred.

Examples of alkylene having up to 18 carbon atoms are ethylene,propylene, trimethylene, tetramethylene, pentamethylene,2,2-dimethyltrimethylene, hexamethylene, trimethylhexamethylene andoctamethylene. C₂-C₆alkylene, in particular hexamethylene is preferred.

An example of C₅-C₇cycloalkylene is cyclohexylene.

An example of C₁-C₄alkylenedi(C₅-C₇cycloalkylene) ismethylenedicyclohexylene.

A preferred example of a 5-to 7-membered heterocyclic ring is amorpholine group.

The meanings of the terminal groups which saturate the free valences inthe compounds of the formula (A-I) depend on the processes used fortheir preparation. The terminal groups can also be modified after thepreparation of the compounds.

If the compounds of the formula (A-I) are prepared by reacting acompound of the formula

in which X₀ is, for example, halogen, in particular chlorine, and A₁₃and A₁₄ are as defined above, with a compound of the formula

in which A₁₁ and A₁₂ are as defined above, the terminal group bonded tothe diamino radical is for example hydrogen or

and the terminal group bonded to the triazine radical is for example X₀or

If X₀ is halogen, it is advantageous to replace this, for example, by—OH or an amino group when the reaction is complete. Examples of aminogroups which may be mentioned are pyrrolidin-1-yl, morpholino, —NH₂,—N(C₁-C₈)alkyl)₂ and —NR₀(C₁-C₈alkyl), in which R₀ is hydrogen or agroup of the formula (Ia).

One of the preferred compounds of the formula (I) is

wherein E₁ is

E₂ is

and a₁ is a number from 1 to 10, preferably 2 to 10. The preparation ofthis compound is described in Example 10 of U.S. Pat. No. 6,046,304.

According to a preferred embodiment

A₁₁ is C₂-C₁₀alkylene,

the radicals A₁₂ independently of one another are hydrogen, C₁-C₄alkylor cyclohexyl,

A₁₃ and A₁₄ independently of one another are hydrogen, C₁-C₄alkyl,cyclohexyl or a group of the formula (a-1),

or the radicals A₁₃ and A₁₄, together with the nitrogen atom to whichthey are bonded, form a morpholino group and

a₁ is a number from 1 to 10, preferably 2 to 10, and the repeating unitsare identical or different;

A₂₁ and A₂₅ independently of one another are hydrogen, C₁-C₄alkyl orcyclohexyl,

A₂₂, A₂₃ and A₂₄ independently of one another are C₂-C₁₀alkylene, and

X₁, X₂, X₃, X₄, X₅, X₆, X₇ and X₈ independently of one another are agroup of the formula (a-2),

in which A₂₆ is hydrogen, C₁-C₄alkyl, cyclohexyl or a group of theformula (a-1) as defined above, and A₂₇ has one of the meanings of A₁₂;

R₁ and R₂ independently of one another are hydrogen, C₁-C₄alkyl orcyclohexyl; and

R₃ and R₄ independently of one another are C₁-C₄alkyl or a group of theformula (a-3)

wherein R₀ has one of the meanings of R₁ and R₂.

According to a further preferred embodiment component A) is a compoundof the formula (A-I-1), (A-I-2), (A-II-1) or (A-III-1),

with a₁ being 2 to 10,

with a₁ being 2 to 10,

wherein X₁, X₂, X₃, X₄, X₅, X₆, X₇ and X₈ are the group

The polyethylene pipe may additionally comprise a component C) which isa phenolic antioxidant, in particular1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene(Irganox®1330), ethylenebis[3,3-bis(3-tert-butyl-4-hydroxyphenyl)butyrate] (Hostanox®03) or1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanurate(Irganox®3114).

The weight ratio of component A) to component C) is preferably 1:10 to10:1, in particular 1:5 to 5:1.

The polyethylene pipe may further comprise a component D) which is atleast one compound selected from the group consisting of phosphites,phosphonites, hydroxylamines, tocopherols and tocopherol acetates. Aphosphite, for example tris(2,4-di-tertbutylphenyl) phosphite,[3,3′,5,5′-tetra-tert.butyl-1,1′biphenyl-2,2′-diyl]-[3-(3-methyl-4-hydroxy-5-tert.butyl-phenyl)-propyl]-phosphite,[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1-methyl-6-tert.butyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphiteor6-[3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin,is particularly preferred.

The weight ratio of component A) to component D) is preferably 1:10 to10:1, in particular 1:5 to 5:1.

Of interest is a polyethylene pipe which comprises components A), B), C)and D). The compounds of components A), B), C) and D) are known and arein essential commercially available.

Component A) is preferably present in the polyethylene in an amount of0.01% to 2% by weight relative to the weight of the polyethylene.

Component B) is preferably present in the polyethylene in an amount of0.01% to 5% by weight relative to the weight of the polyethylene.

Component C) is preferably present in the polyethylene in an amount of0.1% to 5% by weight relative to the weight of the polyethylene.

Component D) is preferably present in the polyethylene in an amount of0.1% to 5% by weight relative to the weight of the polyethylene.

According to a preferred embodiment the polyethylene pipe mayadditionally comprise a pigment, preferably a blue pigment.

The polyethylene of the pipe is preferably selected from HD-PE, MD-PE,LD-PE, LLD-PE, metallocene PE, PE-X, mixture of PE, recycled PE,bi-modal PE, PE-RT, PE 32, PE 40, PE 63, PE 80, PE 100, PE 112, PE 125,PE 100 RC, PE 100 RT and PE 100 RD, in particular from high densitypolyethylene (HD-PE), medium density polyethylene (MD-PE), low densitypolyethylene (LD-PE), linear low density polyethylene (LLD-PE),metallocene polyethylene, crosslinked polyethylene (PE-X), recycledpolyethylene, bi-modal polyethylene and mixtures of polyethylenes.

A particularly preferred polyethylene pipe comprises the components (A),(B), (C) and (D), wherein component (A) is

with a₁ being 2 to 10,

component (B) is a natural or synthetic hydrotalcite,

component (C) is1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene,and

component (D) is tris[2,4-di-tert-butylphenyl]phosphite.

The polyethylene of the pipe according to the present invention mayfurther comprise one or more conventional additives such as:

1. Antioxidants

1.1. Alkylated monophenols, for example2,6-di-tert-butyl-4-methylphenol, 2-tert-butyl-4,6-dimethylphenol,2,6-di-tert-butyl-4-ethylphenol, 2,6-di-tert-butyl-4-n-butylphenol,2,6-di-tert-butyl-4-isobutylphenol, 2,6-dicyclopentyl-4-methylphenol,2-(α-methylcyclohexyl)-4,6-dimethylphenol,2,6-dioctadecyl-4-methylphenol, 2,4,6-tricyclohexylphenol,2,6-di-tert-butyl-4-methoxymethylphenol, nonylphenols which are linearor branched in the side chains, for example,2,6-di-nonyl-4-methylphenol,2,4-dimethyl-6-(1′-methylundec-1′-yl)phenol,2,4-dimethyl-6-(1′-methylheptadec-1′-yl)phenol,2,4-dimethyl-6-(1′-methylpentadec-1′-yl)phenol,2,4-dimethyl-6-(1′-methyltridec-1′-yl)phenol and mixtures thereof.

1.2. Alkylthiomethylphenols, for example2,4-dioctylthiomethyl-6-tert-butylphenol,2,4-dioctylthiomethyl-6-methylphenol,2,4-dioctylthiomethyl-6-ethylphenol,2,6-di-dodecylthiomethyl-4-nonylphenol.

1.3. Hydroquinones and alkylated hydroquinones, for example2,6-di-tert-butyl-4-methoxyphenol, 2,5-di-tert-butylhydroquinone,2,5-di-tert-amylhydroquinone, 2,6-diphenyl-4-octadecyloxyphenol, 2,6-di-tert-butylhydroquinone, 2,5-d i-tert-butyl-4-hydroxyanisole,3,5-di-tert-butyl-4-hydroxyanisole, 3,5-di-tert-butyl-4-hydroxyphenylstearate, bis(3,5-di-tert-butyl-4-hydroxyphenyl) adipate.

1.4. Tocopherols, for example α-tocopherol, β-tocopherol, γ-tocopherol,δ-tocopherol and mixtures thereof (vitamin E).

1.5. Hydroxylated thiodiphenyl ethers, for example2,2′-thiobis(6-tert-butyl-4-methylphenol), 2,2′-thiobis(4-octylphenol),4,4′-thiobis(6-tert-butyl-3-methylphenol),4,4′-thiobis(6-tert-butyl-2-methylphenol),4,4′-thiobis(3,6-di-sec-amylphenol),4,4′-bis(2,6-dimethyl-4-hydroxyphenyl)disulfide.

1.6. Alkylidenebisphenols, for example2,2′-methylenebis(6-tert-butyl-4-methylphenol),2,2′-methylenebis(6-tert-butyl-4-ethylphenol),2,2′-methylenebis[4-methyl-6-(α-methylcyclohexyl)phenol],2,2′-methylenebis(4-methyl-6-cyclohexylphenol),2,2′-methylenebis(6-nonyl-4-methylphenol),2,2′-methylenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(4,6-di-tert-butylphenol), 2,2′-ethylidenebis(6-tert-butyl-4-isobutylphenol),2,2′-methylenebis[6-(α-methylbenzyl)-4-nonyl phenol],2,2′-methylenebis[6-(α,α-dimethylbenzyl)-4-nonylphenol],4,4′-methylenebis(2,6-di-tert-butylphenol),4,4′-methylenebis(6-tert-butyl-2-methyl phenol),1,1-bis(5-tert-butyl-4-hydroxy-2-methylphenyl)butane,2,6-bis(3-tert-butyl-5-methyl-2-hydroxybenzyl)-4-methylphenol ,1,1,3-tris(5-tert-butyl-4-hydroxy-2-methylphenyl)butane,1,1-bis(5-tert-butyl-4-hydroxy-2-methyl-phenyl)-3-n-dodecylmercaptobutane,ethylene glycol bis[3,3-bis(3′-tert-butyl-4′-hydroxyphenyl)butyrate],bis(3-tert-butyl-4-hydroxy-5-methyl-phenyl)dicyclopenta-diene,bis[2-(3′-tert-butyl-2′-hydroxy-5′-methylbenzyl)-6-tert-butyl-4-methylphenyl]terephthalate,1,1-bis-(3,5-dimethyl-2-hydroxyphenyl)butane,2,2-bis(3,5-di-tert-butyl-4-hydroxyphenyl)propane,2,2-bis(5-tert-butyl-4-hydroxy2-methylphenyl)-4-n-dodecylmercaptobutane,1,1,5,5-tetra-(5-tert-butyl-4-hydroxy-2-methylphenyl)pentane.

1.7. O-, N- and S-benzyl compounds, for example3,5,3′,5′-tetra-tert-butyl-4,4′-dihydroxydibenzyl ether,octadecyl-4-hydroxy-3,5-dimethylbenzylmercaptoacetate,tridecyl-4-hydroxy-3,5-di-tert-butylbenzylmercaptoacetate,tris(3,5-di-tert-butyl-4-hydroxybenzyl)amine,bis(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)dithioterephthalate,bis(3,5-di-tert-butyl-4-hydroxybenzyl)sulfide,isooctyl-3,5-di-tert-butyl-4-hydroxybenzylmercaptoacetate.

1.8. Hydroxybenzylated malonates, for exampledioctadecyl-2,2-bis(3,5-di-tert-butyl-2-hydroxybenzyl)malonate,di-octadecyl-2-(3-tert-butyl-4-hydroxy-5-methylbenzyl)malonate,di-dodecylmercaptoethyl-2,2-bis(3,5-ditert-butyl-4-hydroxybenzyl)malonate,bis[4-(1,1,3,3-tetramethylbutyl)phenyI]-2,2-bis(3,5-di-tert-butyl-4-hydroxybenzyl)malonate.

1.9. Aromatic hydroxybenzyl compounds, for example1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene,1,4-bis(3,5-d i-tert-butyl-4-hyd roxybenzyl-2,3,5,6-tetramethylbenzene,2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)phenol.

1.10. Triazine compounds, for example2,4-bis(octylmercapto)-6-(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine,2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyanilino)-1,3,5-triazine,2-octylmercapto-4,6-bis(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,3,5-triazine,2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenoxy)-1,2,3-triazine,1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzypisocyanurate,1,3,5-tris(4-tert-butyl-3-hydroxy-2,6-dimethylbenzyl)isocyanurate,2,4,6-tris(3,5-di-tert-butyl-4-hydroxyphenylethyl)-1,3,5-triazine,1,3,5-tris(3,5-di-tert-butyl-4-hydroxy-phenylpropionyl)-hexahydro-1,3,5-triazine,1,3,5-tris(3,5-dicyclohexyl-4-hydroxybenzypisocyanurate.

1.11. Benzylphosphonates, for exampledimethyl-2,5-di-tert-butyl-4-hydroxybenzylphosphonate,diethyl-3,5-di-tert-butyl-4-hydroxybenzylphosphonate,di-octadecyl3,5-di-tert-butyl-4-hydroxybenzylphosphonate,dioctadecyl-5-tert-butyl-4-hydroxy-3-methylbenzylphosphonate, thecalcium salt of the monoethyl ester of3,5-di-tert-butyl-4-hydroxybenzylphosphonic acid.

1.12. Acylaminophenols, for example 4-hydroxylauranilide,4-hydroxystearanilide, octylN-(3,5-di-tert-butyl-4-hydroxyphenyl)carbamate.

1.13. Esters of β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid withmono- or poly-hydric alcohols, e.g. with methanol, ethanol, n-octanol,i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol,1,2-propanediol, neopentyl glycol, thiodi-ethylene glycol, diethyleneglycol, triethylene glycol, pentaerythritol,tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide,3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol,trimethylolpropane,4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

1.14. Esters of β-(5-tert-butyl-4-hydroxy-3-methylphenyl)propionic acidwith mono- or polyhydric alcohols, e.g. with methanol, ethanol,n-octanol, i-octanol, octadecanol, 1,6-hexanediol, 1,9-nonanediol,ethylene glycol, 1,2-propanediol, neopentyl glycol, thiodi-ethyleneglycol, diethylene glycol, triethylene glycol, pentaerythritol,tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide,3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol,trimethylolpropane,4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane;3,9-bis[2-{3-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyloxy}-1,1-dimethylethyl]-2,4,8,10-tetraoxaspiro[5.5]undecane.

1.15. Esters of β-(3,5-dicyclohexyl-4-hydroxyphenyl)propionic acid withmono- or polyhydric alcohols, e.g. with methanol, ethanol, octanol,octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol,1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethyleneglycol, triethylene glycol, pentaerythritol,tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide,3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol,trimethylolpropane,4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

1.16. Esters of 3,5-di-tert-butyl-4-hydroxyphenyl acetic acid with mono-or polyhydric alcohols, e.g. with methanol, ethanol, octanol,octadecanol, 1,6-hexanediol, 1,9-nonanediol, ethylene glycol,1,2-propanediol, neopentyl glycol, thiodiethylene glycol, diethyleneglycol, triethylene glycol, pentaerythritol,tris(hydroxyethyl)isocyanurate, N,N′-bis(hydroxyethyl)oxamide,3-thiaundecanol, 3-thiapentadecanol, trimethylhexanediol,trimethylolpropane,4-hydroxymethyl-1-phospha-2,6,7-trioxabicyclo[2.2.2]octane.

1.17. Amides of 8-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid e.g.N,N¹-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hexamethylenediamide,N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)trimethylenediamide,N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazide,N,N′-bis[2-(3-[3,5-di-tert-butyl-4-hydroxyphenyl]propionyloxy)ethyl]oxamide(Naugard XL-1, supplied by Uniroyal).

1.18. Aminic antioxidants, for exampleN,N′-di-isopropyl-p-phenylenediamine,N,N′-di-sec-butyl-p-phenylenediamine,N,N′-bis(1,4-dimethylpentyl)-p-phenylenediamine,N,N′-bis(1-ethyl-3-methylpentyl)-p-phenylenediamine,N,N′-bis(1-methylheptyl)-p-phenylenediamine,N,N′-dicyclohexyl-p-phenylenediamine, N,N′-diphenyl-p-phenylenediamine,N,N′-bis(2-naphthyl)-p-phenylenediamine,N-isopropyl-N′-phenyl-p-phenylenediamine,N-(1,3-dimethylbutyl)-N′-phenyl-p-phenylenediamine,N-(1-methylheptyl)-N′-phenyl-p-phenylenediamine,N-cyclohexyl-N′-phenyl-p-phenylenediamine,4-(p-toluenesulfamoyl)diphenylamine,N,N′-dimethyl-N,N′-di-sec-butyl-p-phenylenediamine, diphenylamine,N-allyldiphenylamine, 4-isopropoxydiphenyl-amine,N-phenyl-1-naphthylamine, N-(4-tert-octylphenyl)-1-naphthylamine,N-phenyl-2-naphthylamine, octylated diphenylamine, for examplep,p′-di-tert-octyldiphenylamine, 4-n-butylaminophenol,4-butyrylaminophenol, 4-nonanoylaminophenol, 4-dodecanoylaminophenol,4-octadecanoylaminophenol, bis(4-methoxyphenyl)amine,2,6-di-tert-butyl-4-dimethylaminomethylphenol,2,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylmethane,N,N,N′,N′-tetramethyl-4,4′-diaminodiphenylmethane,1,2-bis[(2-methylphenyl)amino]ethane, 1,2-bis(phenylamino)propane,(o-tolyl)biguanide, bis[4-(1′,3′-di methyl butyl)phenyl]amine,tert-octylated N-phenyl-1-naphthylamine, a mixture of mono- anddialkylated tert-butyl/tert-octyldiphenylamines, a mixture of mono- anddialkylated nonyldiphenylamines, a mixture of mono- and dialkylateddodecyldiphenylamines, a mixture of mono- and dialkylatedisopropyl/isohexyldiphenylamines, a mixture of mono- and dialkylatedtert-butyldiphenylamines, 2,3-dihydro-3,3-dimethyl-4H-1,4-benzothiazine,phenothiazine, a mixture of mono- and dialkylatedtert-butyl/tert-octylphenothiazines, a mixture of mono- and dialkylatedtert-octyl-phenothiazines, N-allylphenothiazine,N,N,N′,N′-tetraphenyl-1,4-diaminobut-2-ene.

2. UV Absorbers and Light Stabilizers

2.1. 2-(2′-Hydroxyphenyl)benzotriazoles, for example2-(2′-hydroxy-5′-methylphenyl)-benzotriazole,2-(3′,5′-di-tert-butyl-2′-hydroxyphenyl)benzotriazole,2-(5′-tert-butyl-2′-hydroxyphenyl)benzotriazole,2-(2′-hydroxy-5′-(1,1,3,3-tetramethylbutyl)phenyl)benzotriazole,2-(3′,5′-di-tert-butyl-2′-hydroxyphenyl)-5-chloro-benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-methylphenyl)-5-chloro-benzotriazole,2-(3′-sec-butyl-5′-tert-butyl-2′-hydroxyphenyl)benzotriazole,2-(2′-hydroxy-4′-octyloxyphenyl)benzotriazole,2-(3′,5′-di-tert-amyl-2′-hydroxyphenyl)benzotriazole,2-(3′,5′-bis-(α,α-dimethylbenzyl)-2′-hydroxyphenyl)benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-(2-octyloxycarbonylethyl)phenyl)-5-chloro-benzotriazole,2-(3′-tert-butyl-5′-[2-(2-ethylhexyloxy)-carbonylethyl]-2′-hydroxyphenyl)-5-chloro-benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-(2-methoxycarbonylethyl)phenyl)-5-chloro-benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-(2-methoxycarbonylethyl)phenyl)benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-(2-octyloxycarbonylethyl)phenyl)benzotriazole,2-(3′-tert-butyl-5′-[2-(2-ethyl hexyloxy)carbonylethyl]-2′-hydroxyphenyl)benzotriazole,2-(3′-dodecyl-2′-hydroxy-5′-methylphenyl)benzotriazole,2-(3′-tert-butyl-2′-hydroxy-5′-(2-isooctyloxycarbonylethyl)phenylbenzotriazole,2,2′-methylene-bis[4-(1,1,3,3-tetramethylbutyl)-6-benzotriazole-2-ylphenol];the transesterification product of2-[3′-tert-butyl-5′-(2-methoxycarbonylethyl)-2′-hydroxyphenyl]-2H-benzotriazolewith polyethlene glycol 300; [R—CH₂CHCOO—CH₂CH₂₂, whereR=3′-tert-butyl-4′-hydroxy-5′-2H-benzotriazol-2-ylphenyl,2-[2′-hydroxy-3′-(α,α-dimethylbenzyl)-5′-(1,1,3,3-tetramethylbutyl)-phenyl]benzotriazole;2-[2′-hydroxy-3′-(1,1,3,3-tetramethylbutyl)-5′-(α,α-dimethylbenzyl)-phenyl]benzotriazole.

2.2. 2-Hydroxybenzophenones, for example the 4-hydroxy, 4-methoxy,4-octyloxy, 4-decyloxy, 4-dodecyloxy, 4-benzyloxy, 4,2′,4′-trihydroxyand 2′-hydroxy-4,4′-dimethoxy derivatives.

2.3. Esters of substituted and unsubstituted benzoic acids, for example4-tert-butyl-phenyl salicylate, phenyl salicylate, octylphenylsalicylate, dibenzoyl resorcinol, bis(4-tert-butylbenzoyl) resorcinol,benzoyl resorcinol, 2,4-di-tert-butylphenyl3,5-di-tert-butyl-4-hydroxybenzoate, hexadecyl3,5-di-tert-butyl-4-hydroxybenzoate, octadecyl3,5-di-tert-butyl-4-hydroxybenzoate, 2-methyl-4,6-di-tert-butylphenyl3,5-di-tert-butyl-4-hydroxybenzoate.

2.4. Acrylates, for example ethyl α-cyano-β,β-diphenylacrylate, isooctylα-cyano-β,β-diphenylacrylate, methyl α-carbomethoxycinnamate, methylα-cyano-β-methyl-p-methoxycinnamate, butylα-cyano-β-methyl-p-methoxy-cinnamate, methylα-carbomethoxy-p-methoxycinnamate,N-(β-carbomethoxy-(3-cyanoyinyl)-2-methylindoline, neopentyltetra(α-cyano-β,β-diphenylacrylate.

2.5. Sterically hindered amines, for example 1,6-Hexanediamine N,N′-bis(1-propyloxy-2,2,6,6-tetramethyl-4-piperidinyl)- N,N′-bis-2-[4,5-bis-(N-n-butyl-NA-propyloxy-2,2,6,6-tetramethyl-4-piperidinyl)-1,3,5-triazine],1,6-Hexanediamine N,N′-bis(2,2,6,6-tetramethyl-4-piperidinyl)- N,N′-bis-2-[4,5-bis-(N-n-butyl-N′-2,2,6,6-tetramethyl-4-piperidinyl)-1,3,5-triazine],carbonic acid bis(1-undecyloxy-2,2,6,6-tetramethyl-4-piperidyl)ester,bis(2,2,6,6-tetramethyl-4-piperidyl)sebacate,bis(2,2,6,6-tetramethyl-4-piperidyl)succinate,bis(1,2,2,6,6-pentamethyl-4-piperidyl)sebacate,bis(1-octyloxy-2,2,6,6-tetramethyl-4-piperidyl)sebacate,bis(1,2,2,6,6-pentamethyl-4-piperidyl)n-butyl-3,5-di-tert-butyl-4-hydroxybenzylmalonate, the condensate of1-(2-hydroxyethyl)-2,2,6,6-tetramethyl-4-hydroxypiperidine and succinicacid, linear or cyclic condensates ofN,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and4-tert-octylamino-2,6-dichloro-1,3,5-triazine,tris(2,2,6,6-tetramethyl-4-piperidyl)nitrilotriacetate,tetrakis(2,2,6,6-tetramethyl-4-piperidyl)-1,2,3,4-butanetetracarboxylate,1,1′-(1,2-ethanediyl)-bis(3,3,5,5-tetramethylpiperazinone),4-benzoyl-2,2,6,6-tetramethylpiperidine, 4-stearyloxy-2,2,6,6-tetramethyl piperidine,bis(1,2,2,6,6-pentamethylpiperidyl)-2-n-butyl-2-(2-hydroxy-3,5-di-tert-butylbenzyl)-malonate,3-n-octyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl)sebacate,bis(1-octyloxy-2,2,6,6-tetramethylpiperidyl)succinate, linear or cycliccondensates ofN,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and4-morpholino-2,6-dichloro-1,3,5-triazine, the condensate of2-chloro-4,6-bis(4-n-butylamino-2,2,6,6-tetramethylpiperidyl)-1,3,5-triazineand 1,2-bis(3-aminopropylamino)ethane, the condensate of2-chloro-4,6-di-(4-n-butylamino-1,2,2,6,6-pentamethylpiperidyl)-1,3,5-triazineand 1,2-bis(3-aminopropylamino)ethane,8-acetyl-3-dodecyl-7,7,9,9-tetramethyl-1,3,8-triazaspiro[4.5]decane-2,4-dione,3-dodecyl-1-(2 ,2,6,6-tetra methyl-4-piperidyl)pyrrolidine-2,5-dione,3-dodecyl-1-(1,2,2,6,6-pentamethyl-4-piperidyl)pyrrolidine-2,5-dione, amixture of 4-hexadecyloxy- and4-stearyloxy-2,2,6,6-tetramethylpiperidine, a condensate ofN,N′-bis(2,2,6,6-tetramethyl-4-piperidyl)hexamethylenediamine and4-cyclohexylamino-2,6-dichloro-1,3,5-triazine, a condensate of1,2-bis(3-aminopropylamino)ethane and 2,4,6-trichloro-1,3,5-triazine aswell as 4-butylamino-2,2,6,6-tetramethylpiperidine (CAS Reg. No.[136504-96-6]); a condensate of 1,6-hexanediamine and2,4,6-trichloro-1,3,5-triazine as well as N,N-dibutylamine and4-butylamino-2,2,6,6-tetramethylpiperidine (CAS Reg. No. [192268-64-7]);N-(2,2,6,6-tetramethyl-4-piperidyl)-n-dodecylsuccinimide,N-(1,2,2,6,6-pentamethyl-4-piperidyl)-n-dodecylsuccinimide,2-undecyl-7,7,9,9-tetramethyl-1-oxa-3,8-diaza-4-oxo-spiro[4,5]decane, areaction product of7,7,9,9-tetramethyl-2-cycloundecyl-1-oxa-3,8-diaza-4-oxospiro-[4,5]decaneand epichlorohydrin,1,1-bis(1,2,2,6,6-pentamethyl-4-piperidyloxycarbonyl)-2-(4-methoxyphenyl)ethene,N,N′-bis-formyl-N,N′-bis(2,2,6,6-tetramethyl-4-piperidypexamethylenediamine,a diester of 4-methoxymethylenemalonic acid with1,2,2,6,6-pentamethyl-4-hydroxypiperidine,poly[methylpropyl-3-oxy-4-(2,2,6,6-tetramethyl-4-piperidyl)]siloxane, areaction product of maleic acid anhydride-α-olefin copolymer with2,2,6,6-tetramethyl-4-aminopiperidine or1,2,2,6,6-pentamethyl-4-aminopiperidine,2,4-bis[N-(1-cyclohexyloxy-2,2,6,6-tetramethylpiperidine-4-yl)-N-butylamino]-6-(2-hydroxyethyl)amino-1,3,5-triazine,1-(2-hydroxy-2-methylpropoxy)-4-octadecanoyloxy-2,2,6,6-tetramethylpiperidine,5-(2-ethylhexanoyl)oxymethyl-3,3,5-trimethyl-2-morpholinone, Sanduvor(Clariant; CAS Reg. No. 106917-31-1],5-(2-ethylhexanoyl)oxymethyl-3,3,5-trimethyl-2-morpholinone, thereaction product of2,4-bis[(1-cyclohexyloxy-2,2,6,6-piperidine-4-yl)butylamino]-6-chloro-s-triazinewith N,N′-bis(3-aminopropyl)ethylenediamine),1,3,5-tris(N-cyclohexyl-N-(2,2,6,6-tetramethylpiperazine-3-one-4-yl)amino)-s-triazine,1,3,5-tris(N-cyclohexyl-N-(1,2,2,6,6-pentamethylpiperazine-3-one-4-yl)amino)-s-triazine,

2.6 Benzoxazi none derivatives such as e.g.2,2′-(1,4-phenylene)bis[4H-3,1-benzoxazin-4-one] (CAS No. 018600-59-4).

2.7. Oxamides, for example 4,4′-dioctyloxyoxanilide,2,2′-diethoxyoxanilide, 2,2′-dioctyloxy-5,5′-di-tert-butoxanilide,2,2′-didodecyloxy-5,5′-di-tert-butoxanilide, 2-ethoxy-2′-ethyloxanilide,N,N′-bis(3-dimethylaminopropyl)oxamide,2-ethoxy-5-tert-butyl-2′-ethoxanilide and its mixture with2-ethoxy-2′-ethyl-5,4′-di-tert-butoxanilide, mixtures of o- andp-methoxy-disubstituted oxanilides and mixtures of o- andp-ethoxy-disubstituted oxanilides.

2.8. 2-(2-Hydroxyphenyl)-1,3,5-triazines, for example2,4,6-tris(2-hydroxy-4-octyloxyphenyl)-1,3,5-triazine,2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,2-(2,4-dihydroxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,2,4-bis(2-hydroxy-4-propyloxyphenyl)-6-(2,4-dimethylphenyl)-1,3,5-triazine,2-(2-hydroxy-4-octyloxyphenyl)-4,6-bis(4-methylphenyl)-1,3,5-triazine,2-(2-hydroxy-4-dodecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,2-(2-hydroxy-4-tridecyloxyphenyl)-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,2-[2-hydroxy-4-(2-hydroxy-3-butyloxypropoxy)phenyl]-4,6-bis(2,4-dimethyl)-1,3,5-triazine,2-[2-hydroxy-4-(2-hydroxy-3-octyloxypropyloxy)phenyl]-4,6-bis(2,4-dimethyl)-1,3,5-triazine,2-[4-(dodecyloxy/tridecyloxy-2-hydroxypropoxy)-2-hydroxyphenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,24-(2-hydroxy-4-[2-hydroxy-3-dodecyloxypropoxy)phenyl]-4,6-bis(2,4-dimethylphenyl)-1,3,5-triazine,2-(2-hydroxy-4-hexyloxy)phenyl-4,6-diphenyl-1,3,5-triazine,2-(2-hydroxy-4-methoxyphenyl)-4,6-diphenyl-1,3,5-triazine,2,4,6-tris[2-hydroxy-4-(3-butoxy-2-hydroxypropoxy)phenyl]-1,3,5-triazine,2-(2-hydroxyphenyl)-4-(4-methoxyphenyl)-6-phenyl-1,3,5-triazine,2-{2-hydroxy-4-[3-(2-ethylhexyl-1-oxy)-2-hydroxypropyloxy]phenyl}-4,6-bis(2,4-di-methylphenyl)-1,3,5-triazine,2,4-bis(4-[2-ethylhexyloxy]-2-hydroxyphenyl)-6-(4-methoxyphenyl)-1,3,5-triazine,2-(4,6-bis-biphenyl-4-yl-1,3,5-triazin-2-yl)-5-(2-ethyl-(n)-hexyloxy)phenol.

3. Metal deactivators, for example N,N′-diphenyloxamide,N-salicylal-N′-salicyloylhydrazine, N,N′-bis(salicyloyl)hydrazine,N,N′-bis(3,5-di-tert-butyl-4-hydroxyphenylpropionyl)hydrazine,3-salicyloylamino-1,2,4-triazole, bis(benzylidene)oxalyl dihydrazide,oxanilide, isophthaloyl dihydrazide, sebacoyl bi-sphenylhydrazide,N,N′-diacetyladipoyl dihydrazide, N,N′-bis(salicyloyl)oxalyldihydrazide, N,N′-bis(salicyloyl)thiopropionyl dihydrazide.

3a. Formamidines, for example Ethoxycarbonylphenyl)-N′-ethyl-N′-phenylformamidine.

4. Phosphites and phosphonites, for example triphenyl phosphite,diphenylalkyl phosphites, phenyldialkyl phosphites, tris(nonylphenyl)phosphite, trilauryl phosphite, trioctadecyl phosphite,distearylpentaerythritol diphosphite, tris(2,4-di-tert-butylphenyl)phosphite, diisodecyl pentaerythritol diphosphite,bis(2,4-di-tert-butylphenyl)pentaerythritol diphosphite,bis(2,4-di-cumylphenyl)pentaerythritol diphosphite,bis(2,6-di-tert-butyl-4-methylphenyl)pentaerythritol diphosphite,diisodecyloxypentaerythritol diphosphite,bis(2,4-di-tert-butyl-6-methylphenyl)pentaerythritol diphosphite,bis(2,4,6-tris(tert-butylphenyl)pentaerythritol diphosphite, tristearylsorbitol triphosphate, tetrakis(2,4-di-tert-butylphenyl)4,4′-biphenylene diphosphonite, [3,3′,5,5′-tetra-tert.butyl-1,1′biphenyl-2,2′-diyl]-[3-(3-methyl-4-hydroxy-5-tert.butyl-phenyl)-propyl]-phosphite,6-isooctyloxy-2,4,8,10-tetra-tert-butyl-12H-dibenz[d,g]-1,3,2-dioxaphosphocin,bis(2,4-di-tert-butyl-6-methylphenyl)methyl phosphite,bis(2,4-ditert-butyl-6-methylphenyl)ethyl phosphite,tris-[4-tert.butyl-2-(5-tert.butyl-3H-1-benzofuran-2-one)-phenyl]-phosphite,tris-[4-(1,1′3,3′-tetramethyl-butane)-2-(5-(1,1′3,3′-tetramethyl-butane-3H-1-benzofuran-2-one)-phenyl]-phosphite,tris-[2,6-dimethyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,bis-[2,6-dimethyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phenyl-phosphite,bis-[2,6-dimethyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-[2,4-di-tert.butyl-phenyl]-phosphite,[3,3′,5,5′-tetra-tert.butyl-1,1′biphenyl-2,2′-diyl]4-tert.butyl-(5-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[3,3′,5,5′-tetra-tert.butyl-1,1′biphenyl-2,2′-diyl]-[2,6-dimethyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[2,2′-methylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1-methyl-6-tert.butyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,bis-(2,6-dimethyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenol)pentaerythritol diphosphite,bis-(1-methyl-6-tert.butyl-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenol)pentaerythritol diphosphite, bis-(4-tert.butyl-(5-tert.butyl)-3H-1-benzofuran-2-one)-phenol) pentaerythritoldiphosphite,bis-(4-(1,1′3,3′-tetramethyl-butane)-(5-(1,1′3,3′-tetramethyl-butane))-3H-1-benzofuran-2-one)-phenol)pentaerythritol diphosphite,6-fluoro-2,4,8,10-tetra-tert-butyl-12-methyl-dibenz[d,g]-1,3,2-dioxaphosphocin,2,2′,2″-nitrilo[triethyltris(3,31,5,51-tetra-tert-butyl-1,1′-biphenyl-2,2′-diyl)phosphite],2-ethylhexyl(3,3′,5,5′-tetra-tert-butyl-1,1′-biphenyl-2,2′-diyl)phosphite,5-butyl-5-ethyl-2-(2,4,6-tri-tert-butylphenoxy)-1,3,2-dioxaphosphirane.

The following phosphites are especially preferred:

Tris(2,4-di-tert-butylphenyl) phosphite (Irgafos® 168, Ciba SpecialtyChemicals Inc.), tris(nonylphenyl) phosphite, phosphorus acid mixed2,4-bis(1,1-dimethylpropyl)phenyl and 4-(1,1-dimethylpropyl)phenyltriesters (CAS Reg. No. 939402-02-5), phosphorous acid triphenyl esterpolymer with alpha-hydro-omega-hydroxypoly[oxy(methyl-1,2-ethanediyl)C₁₀-16 alkyl esters (CAS Reg. No. 1227937-46-3).

[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[2,2′-ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1-methyl-6-tert.butyl-4-(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite,[3,3′,5,5′-tetra-tert.butyl-1,1′biphenyl-2,2′-diyl]-[3-(3-methyl-4-hydroxy-5-tert.butyl-phenyl)-propyl]-phosphite.

5. Hydroxylamines, for example N,N-dibenzylhydroxylamine,N,N-diethylhydroxylamine, N,N-dioctylhydroxylamine,N,N-dilaurylhydroxylamine, N,N-dioctadecylhydroxylamine,N-hexadecyl-N-octadecylhydroxylamine,N-heptadecyl-N-octadecylhydroxylamine, N,N-dialkylhydroxylamine derivedfrom hydrogenated tallow amine.

6. Amine oxides, for example N,N-dibenzylhydroxylamine oxide,N,N-diethylhydroxylamine oxide, N,N-dioctylhydroxylamine oxide,N,N-dilaurylhydroxylamine oxide, N,N-ditetradecylhydroxylamine oxide,N,N-dihexadecylhydroxylamine oxide, N,N-dioctadecylhydroxylamine oxide,N-hexadecyl-N-octadecylhydrox-ylamine oxide,N-heptadecyl-N-octadecylhydroxylamine oxide, N,N-dialkylhydroxylamineoxide derived from hydrogenated tallow amine.

7. Nitrones, for example, N-benzyl-alpha-phenylnitrone,N-ethyl-alpha-methylnitrone, N-octyl-alpha-heptylnitrone,N-lauryl-alpha-undecylnitrone, N-tetradecyl-alpha-tridecylnnitrone,N-hexadecyl-alpha-pentadecylnitrone,N-octadecyl-alpha-heptadecylnitrone,N-hexadecyl-alpha-heptadecylnitrone,N-ocatadecyl-alpha-pentadecylnitrone,N-heptadecyl-alpha-heptadecylnitrone,N-octadecyl-alpha-hexadecylnitrone, nitrone derived fromN,N-dialkylhydroxylamine derived from hydro-genated tallow amine.

8. Thiosynergists, for example dilauryl thiodipropionate, dimistrylthiodipropionate, distearyl thiodipropionate, pentaerythritoltetrakis[3-(dodecylthio)propionate] or distearyl disulfide.

9. Peroxide scavengers, for example esters of β-thiodipropionic acid,for example the lauryl, stearyl, myristyl or tridecyl esters,mercaptobenzimidazole or the zinc salt of 2-mercaptobenzimidazole, zincdibutyldithiocarbamate, dioctadecyl disulfide, pentaerythritoltetrakis((3-dodecylmercapto)propionate.

10. Basic co-stabilizers, for example melamine, polyvinylpyrrolidone,dicyandiamide, triallyl cyanurate, urea derivatives, hydrazinederivatives, amines, polyamides, polyurethanes, alkali metal salts andalkaline earth metal salts of higher fatty acids, for example calciumstearate, zinc stearate, magnesium behenate, magnesium stearate, sodiumricinoleate and potassium palmitate, antimony pyrocatecholate or zincpyrocatecholate, zeolithes, hydrotalcites, hydrocalumites.

11. Nucleating agents, for example inorganic substances, such as talcum,metal oxides, such as titanium dioxide or magnesium oxide, phosphates,carbonates or sulfates of, preferably, alkaline earth metals; organiccompounds, such as mono- or polycarboxylic acids and the salts thereof,e.g. 4-tert-butylbenzoic acid, adipic acid, diphenylacetic acid, sodiumsuccinate or sodium benzoate; polymeric compounds, such as ioniccopolymers (ionomers). Especially preferred are1,3:2,4-bis(3′,4′-dimethylbenzylidene)sorbitol,1,3:2,4-di(paramethyldibenzylidene)sorbitol, and1,3:2,4-di(benzylidene)sorbitol. Beta-nucleating agents are also ofinterest.

12. Fillers and reinforcing agents, for example calcium carbonate,silicates, glass fibres, carbon fibers, glass beads, asbestos, talcum(preferably with a particle size of 0.01 to 20 μm), kaolin, mica, bariumsulfate, metal oxides and hydroxides, carbon black, graphite, wood flourand flours or fibers of other natural products, synthetic fibers.

13. Other additives, for example plasticisers, lubricants, emulsifiers,pigments, rheology additives, catalysts, flow-control agents, opticalbrighteners, flameproofing agents, anti-static agents and blowingagents.

14. Benzofuranones and indolinones, for example those disclosed in U.S.Pat. No. 4,325,863; U.S. Pat. No. 4,338,244; U.S. Pat. No. 5,175,312;U.S. Pat. No. 5,216,052; U.S. Pat. No. 5,252,643; DE-A-4316611;DE-A-4316622; DE-A-4316876; EP-A-0589839, EP-A-0591102; EP-A-1291384 or3-[4-(2-acetoxyethoxy)phenyl]-5,7-di-tert-butylbenzofuran-2-one,5,7-di-tert-butyl-3-[4-(2-stearoyloxyethoxy)phenyl]benzofuran-2-one,3,3′-bis[5,7-di-tert-butyl-3-(4-[2-hydroxyethoxy]phenyl)benzofuran-2-one],5,7-di-tert-butyl-3-(4-ethoxyphenyl)benzofuran-2-one,3-(4-acetoxy-3,5-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one,3-(3,5-dimethyl-4-pivaloyloxyphenyl)-5,7-di-tert-butylbenzofuran-2-one,3-(3,4-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one,3-(2,3-dimethylphenyl)-5,7-di-tert-butylbenzofuran-2-one,3-(2-acetyl-5-isooctylphenyl)-5-isooctylbenzofuran-2-one.

The conventional additive may be present in the polyethylene of the pipeaccording to the present invention in an amount of e.g. 0.001 to 10%,relative to the weight of the polyethylene.

A further embodiment of the present invention is the polyethylene pipeas defined above, which is in contact with chlorinated (commonchlorinated water disinfectants such as chlorine (hypo-chlorite),chlorine dioxide and chloramines) or non-chlorinated water.

Another embodiment of the present invention is the use of a mixturecontaining components A) and B) in a weight ratio of 1:10 to 10:1 forstabilizing a polyethylene pipe.

Still another embodiment of the present invention is a method forstabilizing a polyethylene pipe which comprises incorporating into thepolyethylene components A) and B) in a weight ratio of 1:10 to 10:1.

The embodiments of the present invention include chlorinated ornon-chlorinated water pipes for domestic, municipal or industrialapplications, non-pressure up to high-pressure pipe applications usedfor drinkable or non-drinkable water, for general purpose water or wastewater.

The examples below illustrate the invention in greater detail. Allpercentages and parts are by weight, unless stated otherwise.

Additives used on the following examples:

Irganox®1330:

(CAS number: 1709-70-2)1,3,5-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene

Irgafos®168:

(CAS number: 31570-04-4)

Tris[2,4-di-tert-butylphenyl]phosphite

Sumilizer®GP:

(CAS number: 203255-81-6)

6-[3-(3-tert-Butyl-4-hydroxy-5-methylphenyl)propoxy]-2,4,8,10-tetra-tert-butyldibenzo[d,f][1,3,2]dioxaphosphepin

Compound D-1:

Compound (108) Disclosed in Example S-8 of WO-A-2015/121445

[2,2′-Ethylene-bis-(4,6-di-tert.butyl-phenyl)-1,1′-diyl]-[1,6-dimethyl-4(5,7-di-tert.butyl)-3H-1-benzofuran-2-one)-phenyl]-phosphite

Chimassorb®2020:

(CAS number: 192268-64-7)

wherein E₁ is

E₂ is

and a₁ is a number from 2 to 10.

Hycite®713:

(CAS number: 012304-65-3 or 11097-59-9)

Hydrotalcite (Magnesium aluminum hydroxide carbonate hydrate)

EXAMPLES

Preparation of the test specimens: A mixture of a non-stabilised highdensity polyethylene (HD-PE; Hostalen° CRP-100; natural classified underPE 100 of LyondellBasell; Melt Flow Rate: 190° C./5.0 Kg: 0.23 g/10 min(ISO 1133); Density: 0.95g/cm3 (ISO 1183)) and the additives listed inTable 1 is mixed with a Mixaco Lab CM12 high speed mixer device.

The obtained full formulation is then compounded on a Collin 25X42Dextruder at 240° C. and then injection molded on an Engel HL65 injectionmolding machine at 230° C.

The injection molded plaques 40 mm×60 mm×2 mm are exposed to chlorinatedwater under the following parameters: 40° C., pH 7, 2 mg/L NaClO and 50L/hours. The parameters measured are OIT Values using a DSC Q2000 von TAInstrument (Waters) at 200° C. under O₂ after 0, 3 and 5 monthsexposition. The depletion results are listed in Table 2.

TABLE 1 Additive Formulation No. 0.3% of Irganox ®1330 + 0.1% ofIrgafos ®168 + 0 0.2% of Hycite ®713 0.3% of Irganox ®1330 + 0.1% ofIrgafos ®168 1 plus 0.2% of Chimassorb ®2020 + 0.2% of Hycite ®713 0.3%of Irganox ®1330 + 0.1% of Sumilizer ®GP 2 plus 0.2% ofChimassorb ®2020 + 0.2% of Hycite ®713 0.3% of Irganox ®1330 + 0.1% ofCompound (D-1) 3 plus 0.2% of Chimassorb ®2020 + 0.2% of Hycite ®7130.3% of Irganox ®1330 + 0.1% of a mixture of 4 Compound (D-1) andIrgafos ®168 in a weight ratio of 10/1 plus 0.2% of Chimassorb ®2020 +0.2% of Hycite ®713

TABLE 2 Formulation OIT at OIT after OIT after No. time zero 3 months 5months 0 50 50 50 1 240 200 190 2 220 180 160 3 280 200 200 4 230 190180

High OIT-values are desired.

1. A polyethylene pipe comprising components A) and B), whereincomponent A) is a hindered amine light stabilizer comprising a triazineresidue, component B) is a natural or synthetic hydrotalcite, and aweight ratio of component A) to component B) is 1:10 to 10:1.
 2. Thepolyethylene pipe according to claim 1 wherein component A) is at leastone compound of the formula (A-I), (A-II) or (A-III):

wherein A₁₁ is C₂-C₁₈alkylene, C₅-C₇cycloalkylene orC₁-C₄alkylenedi(C₅-C₇cycloalkylene), the radicals A₁₂ independently ofone another are hydrogen, C₁-C₁₂alkyl, C₅-C₁₂cycloalkyl, A₁₃ and A₁₄independently of one another are hydrogen, C₁-C₁₂alkyl, C₅-C₁₂cycloalkylor a group of the formula (a-1),

or the radicals A₁₃ and A₁₄, together with the nitrogen atom to whichthey are bonded, form a 5- to 10-membered heterocyclic ring and a₁ is anumber from 1 to 20, and the repeating units are identical or different;

wherein A₂₁ and A₂₅ independently of one another are hydrogen,C₁-C₁₂alkyl, C₅-C₁₂cycloalkyl or a group of the formula (a-1), A₂₂, A₂₃and A₂₄ independently of one another are alkylene, and X₁, X₂, X₃, X₄,X₅, X₆, X₇ and X₈ independently of one another are a group of thefornlula (a-2),

in which A₂₆ is hydrogen, C₁-C₁₂alkyl, C₅-C₁₂cycloalkyl or a group ofthe formula (a-1) as defined above, and A₂₇ has one of the meanings ofA₁₂;

wherein R₁ and R₂ independently of one another are hydrogen,C₁-C₂₂alkyl, —O., —OH, —CH₂CN, C₁-C₁₈alkoxy, C₂-C₁₈alkoxy substituted by—OH; C₅-C₁₂cycloalkoxy, C₃-C₆alkenyl, C₃-C₆akenyloxy, C₇-C₉phenyialkylunsubstituted or substituted on the phenyl by 1, 2 or 3 C₁-C₄alkyl; orC₁-C₈acyl; and R₃ and R₄ independently of one another are C₁-C₂₂alkyl ora group of the formula (a-3)

wherein R₀ has one of the meanings of R₁ and R₂.
 3. The polyethylenepipe according to claim 2, wherein A₁₁ is C₂-C₁₀alkylene, the radicalsA₁₂ independently of one another are hydrogen, C₁-C₄alkyl or cyclohexyl,A₁₃ and A₁₄ independently of one another are hydrogen, C₁-C₄alkyl,cyclohexyl or a group of the formula (a-1),

or the radicals A₁₃ and A₁₄, together with the nitrogen atom to thichthey are bonded, form a motpholino group and a₁ is a number from 1 to10, and the repeating units are identical or different; A₂₁ and A₂₅independently of one another are hydrogen, C₁-C₄alkyl or cyclohexyl,A₂₂, A₂₃ and A₂₄ independently of one another are C₂-C_(l0)alkylene, andX₁, X₂, X₃, X₄, X₅, X₆, X₇ and X₈ independently of one another are agroup of the formula (a-2),

in which A₂₆ is hydrogen, C₁-C₄alkyl, cyclohexyl or a group of theformula (a-1) as defined above, and A₂₇ has one of the meanings ofA_(l2); R₁ and R₂ independently of one another are hydrogen, C₁-C₄alkylor cyclohexyl; and R₃ and R₄ independently of one another are C₁-C₄alkylor a group of the formula (a-3)

wherein R₀ has one of the meanings of R₁ and R₂.
 4. The polyethylenepipe according to claim 1, wherein component A) is a compound of theformula (A-I-1), (A-I-2), (A-II-1) or (A-III-1),

with a₁ being 2 to 10,

with a₁ being 2 to 10,

wherein X₁, X₂, X₃, X₄, X₅, X₆, X₇ and X₈ are the group


5. The polyethylene pipe according to claim 1, wherein component B) isat least one selected from the group consisting of magnesium aluminumhydroxide carbonate hydrate and zinc aluminum hydroxide carbonatehydrate.
 6. The polyethylene pipe according claim 5, further comprisinga component C) which is a phenolic antioxidant.
 7. The polyethylene pipeaccording to claim 1, further comprising a components)) which is atleast one compound selected from the group consisting of phosphites,phosphonites, hydroxylamines, tocopherols and tocopherol acetates. 8.The polyethylene pipe according to claim 6, wherein the phenolicantioxidant is1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene;ethylene bis[3,3-his(3-tert-butyl4-hydroxyphenyl)butyrate] or1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-isocyanurate.
 9. Thepolyethylene pipe according to claim 7, wherein component D) is aphosphite.
 10. The polyethylene pipe according to claim 1, furthercomprising a pigment.
 11. The polyethylenepipe according to claim 1,wherein the polyethylene is selected from the group consisting of highdensit' polyethylene (HD-PE), medium density polyethylene (MD-PE), lowdensity polyethylene (LD-PE), linear low density polyethylene (LLD-PE),metallocene polyethylene, crosslinked polyethylene (PE-X), recycledpolyethylene, bi-modal polyethylene and mixtures of polyethylenes. 12.The polyethylene pipe according to claim 1, further comprisingcomponents C) and D), wherein component (A) is

with a₁ being 2 to 10, component (B) is a natural or synthetichydrotalcite, component (C) is1,3,5-tris(3,5-di-tert-butyl-4-hydroxybenzyl)-2,4,6-trimethylbenzene,and component (D) is tris[2,4-di-tert-butylphenyl]phosphite.
 13. Thepolyethylene pipe according to claim 1, which is in contact withchlorinated or non-chlorinated water.
 14. (canceled)
 15. A method forstabilizing a polyethylene pipe, the method comprising incorporatingpolyethylene components A) and B) in a weight ratio of 1:10 to 10:1 intothe pipe, wherein component A) is a hindered amine light stabilizercomprising a triazine residue, and component B) is a natural orsynthetic hydrotalcite.